CBOR Algorithms for Object Signing and Encryption (COSE)
draft-ietf-cose-rfc8152bis-algs-00
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Active Internet-Draft (cose WG)
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Jim Schaad
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2019-01-21
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IETF
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(None)
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I-D Exists
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COSE Working Group J. Schaad
Internet-Draft August Cellars
Obsoletes: 8152 (if approved) January 21, 2019
Intended status: Standards Track
Expires: July 25, 2019
CBOR Algorithms for Object Signing and Encryption (COSE)
draft-ietf-cose-rfc8152bis-algs-00
Abstract
Concise Binary Object Representation (CBOR) is a data format designed
for small code size and small message size. There is a need for the
ability to have basic security services defined for this data format.
This document defines the CBOR Object Signing and Encryption (COSE)
protocol. This specification describes how to create and process
signatures, message authentication codes, and encryption using CBOR
for serialization. COSE additionally describes how to represent
cryptographic keys using CBOR.
In this specification the conventions for the use of a number of
cryptographic algorithms with COSE. The details of the structure of
COSE are defined in [I-D.schaad-cose-rfc8152bis-struct].
This document along with [I-D.schaad-cose-rfc8152bis-struct]
obsoletes RFC8152.
Contributing to this document
The source for this draft is being maintained in GitHub. Suggested
changes should be submitted as pull requests at <https://github.com/
cose-wg/cose-rfc8152bis>. Instructions are on that page as well.
Editorial changes can be managed in GitHub, but any substantial
issues need to be discussed on the COSE mailing list.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Schaad Expires July 25, 2019 [Page 1]
Internet-Draft COSE Algorithms January 2019
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 25, 2019.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Terminology . . . . . . . . . . . . . . . . 4
1.2. Document Terminology . . . . . . . . . . . . . . . . . . 4
1.3. CBOR Grammar . . . . . . . . . . . . . . . . . . . . . . 4
2. Signature Algorithms . . . . . . . . . . . . . . . . . . . . 4
2.1. ECDSA . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.1. Security Considerations . . . . . . . . . . . . . . . 6
2.2. Edwards-Curve Digital Signature Algorithms (EdDSAs) . . . 7
2.2.1. Security Considerations . . . . . . . . . . . . . . . 8
3. Message Authentication Code (MAC) Algorithms . . . . . . . . 8
3.1. Hash-Based Message Authentication Codes (HMACs) . . . . . 8
3.1.1. Security Considerations . . . . . . . . . . . . . . . 9
3.2. AES Message Authentication Code (AES-CBC-MAC) . . . . . . 10
3.2.1. Security Considerations . . . . . . . . . . . . . . . 11
4. Content Encryption Algorithms . . . . . . . . . . . . . . . . 11
4.1. AES GCM . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1.1. Security Considerations . . . . . . . . . . . . . . . 12
4.2. AES CCM . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.1. Security Considerations . . . . . . . . . . . . . . . 15
4.3. ChaCha20 and Poly1305 . . . . . . . . . . . . . . . . . . 15
4.3.1. Security Considerations . . . . . . . . . . . . . . . 16
5. Key Derivation Functions (KDFs) . . . . . . . . . . . . . . . 16
5.1. HMAC-Based Extract-and-Expand Key Derivation Function
(HKDF) . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2. Context Information Structure . . . . . . . . . . . . . . 18
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